About: http://webisa.webdatacommons.org/289067376

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	All of these generally known systems utilize time measurements, i.e. the time required for electromagnetic energy to travel the distance between the unknown and known geographical locations.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com